Note that this is an informal way of saying, so you can say this only to someone who is the same age, or who are younger than you.

Answering this question, you can say “내 이름은 __야” which means “My name is __.”

Or you can also say “나는 __야.” which means “I’m __.”

‘나’ means ‘I’ in Korean and ‘내’ is a possessive form of ‘나’ which is ‘my’.

[Formal]

Q: 성함이 뭐에요?

A: 제 이름은 _예요. / 저는 _예요.

‘성함’ also means ‘name’ like ‘이름’ but it’s more formal and more courteous.

‘요’ is a Korean particle that has a meaning of respect. So “성함이 뭐예요” has the same meaning as “이름이 뭐야?” but it has more respect.

You can use this phrase to people who are older than you, or at work or people who you are not yet close with.

When you answer, you don’t say ‘성함’ for your own name because you want to humble yourself. You say “제 이름은 __예요.” which means “My name is __”. Or “I’m __” if you remember from the previous video, ‘요’ is a particle that shows respect, ‘저’ is a humble form of ‘나’ and ‘제’ is it’s possessive form.

[Honorific]

Q: 성함이 어떻게 되세요?

A: 제 이름은 _예요. / 저는 __예요.

Honorific of “What’s your name” is not that different from the formal one, but you can ask a bit indirectly, saying “성함이 어떻게 되세요?” which literally means “How is your name.” Rather than directly asking ‘성함이 뭐예요?” which means “What is your name?”.

Now we mastered “how to ask for and respond names in Korean!” If you guys want to know how to spell your names in Korean characters Hangul, please leave a comment below and I will answer them. Please subscribe to my channel to learn more about Korean! Thank you!

I think both of you slightly misunderstood Rica’s question.
She probably already knows how to use them, but she’s asking the difference in usage of 이/가 & 은/는.

Her question is probably, when do you have to use 은/는 or 이/가 instead of the other.

Basically, you can interchange both of them without a problem, but usually:
1) When you start with a certain topic you use 은/는 since it’s the first time you talk about this topic.
2) 은/는 can be used to make a contrast between 2 different items
3) 은/는 can be used to emphasize a certain item

After that, if you repeat the subject, you can start using 이/가 since the listener already knows about which subject you’re talking. However when you start talking about a different topic, you’ll have to use 은/는 again, in order to let the listener know that you’re talking about something else.

What you just really need to know about 이/가 is that is usually marks the subject, but not always, and that you can use it after having used 은/는 in a previous sentence and the subject stays the same.

I’m sure I forgot some stuff, but with this post, you’ll probably receive the answer you’re looking for!